Headphone



FIG. 1 is a front perspective view of a headphone, showing our design;

FIG. 2 is a rear perspective view thereof,

FIG. 3 is front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is an opposing side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines form no part of the claimed design. 

The ornamental design for a headphone, as shown and described. 